UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 13F

                               FORM 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: March 31, 2004

Check here if Amendment [X]; Amendment Number: 1

This Amendment (Check only one.):   [ ] is a restatement
                                    [X] adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:      The Cincinnati Casualty Company
Address:   6200 South Gilmore Road
           Fairfield, Ohio 45014

13F File Number: 028-10755

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing the Report on Behalf of Reporting Manager:

Name:    Kenneth S. Miller
Title:   Sr. Vice President
Phone:   (513) 870-2000

Signature, Place and Date of Signing:


/s/ Kenneth S. Miller                   Fairfield, Ohio           March 23, 2007
-------------------------------------   -----------------------   --------------

Report Type (Check only one.):

[X]  13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager
     are reported in this report.)

[ ]  13F NOTICE. (Check here if no holdings reported are in this report, and all
     holdings are reported by other reporting manager(s).)

[ ]  13F COMBINATION REPORT. (Check here if a portion of the holdings for this
     reporting manager are reported in this report and a portion are reported by
     other reporting manager(s).)

List of other Managers Reporting for this Manager: N/A


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                                    FORM 13F
                                  SUMMARY PAGE

Report Summary:

Number of Other Included Managers                  1

Form 13F Information Table Entry Total:            2

Form 13F Information Table Value Total:        9,052
                                          (thousands)

List of Other Included Managers:

     No.   File No.    Name

     01    028-10798   Cincinnati Financial Corporation


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        COLUMN 1            COLUMN 2     COLUMN 3 COLUMN 4            COLUMN 5           COLUMN 6  COLUMN 7     COLUMN 8
----------------------------------------------------------------------------------------------------------------------------
                            TITLE OF               VALUE   SHRS OR PRN                 INVESTMENT    OTHER  VOTING AUTHORITY
     NAME OF ISSUER           CLASS       CUSIP   [x$1000]     AMT     SH/PRN PUT/CALL DISCRETION  MANAGERS SOLE SHARED NONE
----------------------------------------------------------------------------------------------------------------------------
                                                                                       
ALLTEL CORP 7.75%
   EQUITY UNITS         CONVERTIBLE PFD 020039822   3,804     75,000   SH              SHARED         01     --    --    --
UNITED FIRE & CASUALTY
   6.375% CV PF         CONVERTIBLE PFD 910331305   5,248    175,000   SH              SHARED         01     --    --    --
                                                    9,052



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